Tham khảo tài liệu 'handbook of polymer synthesis second edition episode 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 6 Metathesis Polymerization of Cycloolefins Ulrich Frenzel Bettina K. M. Muller and Oskar Nuyken Technische Universitat Munchen Garching Germany I. INTRODUCTION The term olefin metathesis refers to an interchange reaction of alkylidene groups between alkenes. The total number of double bonds remains unchanged 1 . The history of olefin metathesis started in the mid 1950s when Anderson and Merckling Du Pont - during their work on the Ziegler-Natta polymerization of norbornene NBE - received by means of TiCl4 EtMgBr catalysts a novel polymer 2 3 . In 1957 Eleuterio Du Pont filed a patent which describes the polymerization of several cyclic olefins employing among others LiAlH4-activated MoO3 Al2O3 catalysts 4 . Ozonolysis of a norbornene polymer yielded m-cyclopentane-1 3-dicarboxylic acid thus demonstrating the novel and unexpected nature of this polymerization reaction 4 5 . 1 In the same year Peters and Evering patented a disproportionation reaction of propene yielding ethene and 2-butene with Al z-Bu 3 MoO3 Al2O3-catalysts as the first metathetical conversion of acyclic alkenes 6 . The first report on the metathesis of acyclic olefins in the open literature appeared in 1964. It describes the disproportionation of olefins into homologs of higher and lower molecular weight using Mo CO 6 Al2O3 catalysts 7 . At this time ring-opening metathesis polymerization and metathesis of acyclic olefins -originally considered as olefin disproportionation 7 - were regarded as two different reactions. Calderon recognized in 1972 that these both are two sides of the same coin and introduced the term olefin metathesis for this reaction type 8-11 . Copyright 2005 by Marcel Dekker. All Rights Reserved. From these very beginnings the olefin metathesis reaction is a central topic of industrial as well as academic research due to its great synthetic applicability. Many reviews and monographs about this topic were published since then 1 12-31 . The most important metathesis reaction .
